Abstract
High performance mixed potential type NO2 sensors using porous yttria-stabilized zirconia (YSZ) layers doped with different concentration graphite as solid electrolyte and LaFeO3 as sensing electrode were fabricated and characterized. LaFeO3 was prepared by a typical citrate sol–gel method and characterized using XRD. The surface morphology and porosity of porous YSZ layers were characterized by field emission scanning electron microscope (FESEM). The sensor doped with 3 wt% graphite shows the highest response (−76.4 mV to 80 ppm NO2) and the response is linearly dependent on the logarithm of NO2 concentration in the range of 10–200 ppm. The sensor measurement results also present good repeatability and cross-sensitivity.
Highlights
With the accelerated development of automobiles and industry, gas emission has caused serious environmental disasters and human diseases
Mixed potential type gas sensors consist of a high-temperature stable electrolyte, a porous sensitive electrode (SE), and a reference electrode (RE)
We report a high performance mixed potential type NO2 sensor using the porous
Summary
With the accelerated development of automobiles and industry, gas emission has caused serious environmental disasters and human diseases. Due to these proposed technologies, the TBP increases effectively Some of those methods like mixing YSZ with sensitive material, which causes the covering of the electrochemical reaction sites and resulting in a low response. Other methods such as using high-cost ion beam etching need complex processes and make the experiment difficult to be repeated. Comparing to existing publications [16,17,18], the working temperature of the presented sensor is lower than most of the publications This high performance mixed potential type NO2 sensor could be installed on an exhaust pipe without extra heating units and could monitor the NO2 emission in the low-temperature region. The experiment on sensor material preparation, device fabrication and the detailed investigation of the properties of the fabricated sensor are presented
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